This essay discusses how human resource management (HRM) contributes to an organisation’s effectiveness as well as its ineffectiveness. The Australian Human Resource Institute (AHRI) Model of Excellence is the tool used in this essay. This tool is a graphical depiction of expected behaviours and capabilities essential for HR practitioners to effectively manage their portfolios. The essay discusses the areas of HRM practice, procedures, strategy, employee development, and talent management. It also considers ethics and how understanding employee relations impacts on the effectiveness of an organisation.